Objectives For real-time precise point positioning (PPP) solutions, precise satellite orbit and clock correction products are required, and is highly dependent on network transmission.

Methods This paper proposes a real-time monitoring method for coseismic displacement based on BeiDou satellite navigation system (BDS) PPP-B2b signals, which enables direct utilization of global navigation satellite system (GNSS) receivers to simultaneously receive observation data and correction signals for real-time precise positioning.

Results By retrospectively inverting 1 Hz GNSS observation data for the 2022 Luding Ms 6.8 earthquake in Sichuan, the average root mean square of static PPP in the horizontal direction based on B2b correction products can reach 1-2 cm, and in the vertical direction can reach 2-4 cm. In the kinematic PPP mode, using WUM precise products as a reference, the displacement waveforms calculated based on B2b correction products have differences of only 0.56 cm and 1.08 cm in the east and north directions, respectively. The magnitude of the Luding earthquake determined using the displacement waveforms from B2b products and WUM products is Ms 6.76 and Ms 6.67, respectively. Compared with the magnitude announced by the China Earthquake Administration, they differ by only 0.04 magnitude units.

Conclusions This study indicates that the PPP method based on BDS B2b correction signals can be applied to real-time seismic monitoring and rapid determination of seismic parameters.